fstrim on 30 GB ntfs partition says 16 EiB (18446744073709551615 bytes) trimmed

[EdiD]

fstrim on 30 GB ntfs partition says 16 EiB (18446744073709551615 bytes) trimmed
SSD: Plextor M5pro 128GB

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: util-linux 2.26.2-6ubuntu3
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Nov 16 17:41:03 2015
InstallationDate: Installed on 2015-10-22 (25 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: util-linux
UpgradeStatus: No upgrade log present (probably fresh install)

[Phillip Susi (psusi)]

You will have to provide more detailed information on what command you ran and how you mounted the filesystem on which you ran it. When I try to run fstrim an an ntfs filesystem, I just get "fstrim: /mnt: the discard operation is not supported".

[EdiD (grzesiek20)]

I use :
sudo fstrim -va

drive is mounted automatically on startup with this fstab standard parameters :
/mnt/PLX2 auto nosuid,nodev,nofail,x-gvfs-show 0 0

[Phillip Susi (psusi)]

The -a means to run on all mounted filesystems, so the error could be from any of them. Try running it on each filesystem and see which one is causing the message ( which likely isn't your ntfs partition ).

[EdiD (grzesiek20)]

No it couldn't because -v (verbose) option is telling exactly what fstrim has done on what partition.

[Phillip Susi (psusi)]

Did you not show all of the output? That is, does it specifically say that error happened while trimming the ntfs partition?

[Phillip Susi (psusi)]

Ahh, I was able to reproduce this with a loop mounted ntfs image. Looks like a bug in the ntfs-3g driver.

[Jean-Pierre (jean-pierre-andre)]

Proposed patch for reporting the real trimmed size attached

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "Proposed patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[EdiD (grzesiek20)]

How to apply this ?

[EdiD (grzesiek20)]

Maybe this is not ntfs-3g driver bug. I have just compiled latest stable version of ntfs-3g 2015.3.14 (March 31, 2015) and the issue is still present
In Ubuntu 15.10 default ntfs-3g driver version is: 2014.2.15AR.3-3

[Jean-Pierre (jean-pierre-andre)]

> Maybe this is not ntfs-3g driver bug.
The bug is present in all ntfs-3g versions earlier than Nov 23, 2015.
The bug is only about the reported trimming count when using the option -v. The trimming operation is not affected by the bug, so you probably need not apply the patch if you do not know how to.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.